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Stan Wehbe, Feleke Zewge, Yoshihiko Inagaki, Wolfram Sievert, Tirumala Uday Kumar Nutakki and Akshay Deshpande
A mechanistic model was developed to simulate one-dimensional pesticide transport in two-stage vertical flow constructed wetland. The two pesticides taken under study were carbendazim and chlorothalonil. The water flow patterns within the constructed wet...
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Christos Tzimopoulos, Nikiforos Samarinas, Basil Papadopoulos and Christos Evangelides
The process of how soil moisture profiles evolve into the soil and reach the root zone could be estimated by solving the appropriate strong nonlinear Richards? equation. The nonlinearity of the equation occurs because diffusivity D is generally an expone...
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Satbir Guram and Rashid Bashir
To counter the impacts of climate change and urbanization, engineers have developed ingenious solutions to reduce flooding and capture stormwater contaminants through the use of Low Impact Developments (LIDs). The soil is generally considered to be compl...
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Vladimir Castanedo, Heber Saucedo and Carlos Fuentes
Water infiltration is simulated by obtaining the time infiltrated depth evolution and humidity profiles with the numerical solution of the two-dimensional Richards? equation. The contact time hypothesis is accepted in this study and used to apply a uniqu...
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Adam Szymkiewicz, Anna Gumula-Kawecka, Dawid Potrykus, Beata Jaworska-Szulc, Malgorzata Pruszkowska-Caceres and Wioletta Gorczewska-Langner
Estimation of contaminant travel time through the vadose zone is needed for assessing groundwater vulnerability to pollution, planning monitoring and remediation activities or predicting the effect of land use change or climate change on groundwater qual...
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Fuxin Zheng, Yuanzheng Zhai, Xuelian Xia, Zhihua Yin, Qingqing Du, Rui Zuo, Jinsheng Wang, Yanguo Teng and Mo Xu
The protection of an unsaturated zone is essential for groundwater-quality security. Neglecting pollutant changes in the saturated zone can affect the accuracy of groundwater-quality assessments. Unlike water sampling, the nonreproducibility of soil samp...
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Benjamin Belfort, Ivan Toloni, Philippe Ackerer, Solenn Cotel, Daniel Viville and François Lehmann
The characterization of vadose zone processes is a primary goal for understanding, predicting, and managing water resources. In this study, the issue of soil water monitoring on a vertical profile in the small forested Strengbach catchment (France) is in...
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Mohammad Islam, Abdul Hye and Abdulla Mamun
Finite element discretization of the pressure head form of the Richards equation leads to a nonlinear model, which yields numerical convergence difficulties. When the numerical solution to this problem has either an extremely sharp moving front, infiltra...
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Mohammad S. Islam, Claudio Paniconi and Mario Putti
The lookup table option, as an alternative to analytical calculation for evaluating the nonlinear heterogeneous soil characteristics, is introduced and compared for both the Picard and Newton iterative schemes in the numerical solution of Richards? equat...
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Cheng-Yu Ku, Chih-Yu Liu, Jing-En Xiao and Weichung Yeih
In this paper, a novel meshless method for the transient modeling of subsurface flow in unsaturated soils was developed. A linearization process for the nonlinear Richards equation using the Gardner exponential model to analyze the transient flow in the ...
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